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Study on Poplar Degeneration in Zhangbei County,Hebei Province —A case study in Panchengying
CHENG Yueming, ZHANG Yuan, CUI Shuo, MA Changming
Forest and Grassland Resources Research . 2015, (1): 152 -155 .  DOI: 10.13466/j.cnki.lyzygl.2015.01.027